``Which brings us to, well, Goldman's Sigma X, which moments ago, in a far less pompous presentation, was fined - not by the AG, not by the SEC, but by lowly Finra - for "Failing to Prevent Trade-Throughs in its Alternative Trading System." In essence, what Goldman is said to have done is engage in the same latency arbitrage gimmicks that Michael Lewis and so many others have accused the "fair and efficient" US equity markets of doing for years...''